Hello Brian, this is what I witnessed and experienced in late Autumn/early winter of 1972.
I was seven at the time, but remember this as clearly as if it happened last week.
There are some simple drawings of this event to help clarify what is not apparent in the report. This sighting took place approximately 40 miles NW of Chicago in St. Charles Illinois.
Below is the entire letter with diagrams:
Email Brian Vike: firstname.lastname@example.org
Brian Vike, The Vike Factor (Into The Paranormal) http://the-v-factor-paranormal.blogspot.com/